GB2059296A - Coating band material - Google Patents

Coating band material Download PDF

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Publication number
GB2059296A
GB2059296A GB8020817A GB8020817A GB2059296A GB 2059296 A GB2059296 A GB 2059296A GB 8020817 A GB8020817 A GB 8020817A GB 8020817 A GB8020817 A GB 8020817A GB 2059296 A GB2059296 A GB 2059296A
Authority
GB
United Kingdom
Prior art keywords
spreading roller
roller
scraper blade
band material
coating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB8020817A
Other versions
GB2059296B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ERKKILA M
RUUSUNEN M
Original Assignee
ERKKILA M
RUUSUNEN M
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ERKKILA M, RUUSUNEN M filed Critical ERKKILA M
Publication of GB2059296A publication Critical patent/GB2059296A/en
Application granted granted Critical
Publication of GB2059296B publication Critical patent/GB2059296B/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/06—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length by rubbing contact, e.g. by brushes, by pads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0813—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line characterised by means for supplying liquid or other fluent material to the roller
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0826—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0847—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the circumferential speed of the coating roller and the work speed having same direction but different value
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/12—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being fed round the roller
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H5/00—Special paper or cardboard not otherwise provided for
    • D21H5/0005—Processes or apparatus specially adapted for applying liquids or other fluent materials to finished paper or board, e.g. impregnating, coating
    • D21H5/0025—Processes or apparatus specially adapted for applying liquids or other fluent materials to finished paper or board, e.g. impregnating, coating by contact with a device carrying the treating material
    • D21H5/003—Processes or apparatus specially adapted for applying liquids or other fluent materials to finished paper or board, e.g. impregnating, coating by contact with a device carrying the treating material with a roller

Landscapes

  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

Band material is coated on one side with a solvent-based coating using a scraper blade (2) fitted against a rotary spreading roller (4). Coating substance is supplied at (7) into the trough (11) formed by the roller and blade. The direction of rotation of the roller is such that the surface of the roller moves downwards at the contact point between the roller and blade. The coating substance is transferred from the roller onto the surface of the band material running in contact with the roller. <IMAGE>

Description

SPECIFICATION Process and apparatus for coating band material by means of a spreading roller The subject of the present invention is a process for coating band material on one side with a liquid or pasty substance, in particular with a solvent-based coating, so that a scraper blade is fitted against a rotary spreading roller and the band material is guided so as to pass by the spreading roller so that the band material contacts the spreading roller, and coating substance is passed to above the scraper blade, into a trough formed by the mantle of the spreading roller and by the scraper blade, whereby the direction of rotation of the spreading roller is such that the surface of the spreading roller moves downwards at the contact point between the spreading roller and the scraper blade.Another subject of the present invention is an apparatus for the implementation of the process, which apparatus comprises a spreading roller and a scraper blade fitted in contact with the roller as well as means for passing coating substance onto the scraper blade into the trough formed by the mantle of the spreading roller and by the scraper blade.
There are several known processes and devices for silicone coating of films and papers. One known process is the so-called rod coating, in which the coating roller rotates as partly submerged into a basin of coating substance and the band to be coated is passed between the coating roller and a counter-roller of rubber, fitted above the coating roller, while the coating substance is transferred from the coating roller onto the bottom face of the band. In order that the coating substance should rise with the coating roller as an appropriately thin layer, its viscosity must be relatively low, owing to which its dry-material content may be only 3 to 8 per cent. It is also possible to use a screen-surfaced coating roller. The excess of coating substance may be removed from the coating roller by using a scraper blade, i.e. doctor blade, fitted in contact with the roller.
So-called counter-roller coating is also known, in which any extra coating substance is wiped off from the coating roller by means of a counter-roller fitted alongside the coating roller and rotating in the same direction with the latter. In so-called 4-roller and 3-roller coating processes even more rollers may be fitted side by side and/or one on top of the other.
In air-brush coating any extra coating substance is removed from the surface of the band by means of air-blowing.
In all of the methods described above, the band material runs above the spreading roller in contact with the roller, and the coating substance is transferred onto the bottom face of the band. The transfer of the substance takes place from below upwards, in which case the substance must be readily flowing.
In order that the coating substance layer could be made sufficiently viscous, very high quantities of solvent must be used, even 95 to 97% of the quantity of the paste to be applied. During the manufacturing process, the solvent must be evaporated. Since, expressly in connection with silicone coating, as solvents are used toxic aromatic hydrocarbons, such as toluene, methylketone, benzene, hexane, etc., abundant quantities of solvent vapours cause risks both in the fire security and in the field of work hygiene. Moreover, large quantities of solvents require a lot of drying energy, because the drying air must not include solvents even nearly as explosive quantities. The hot drying air must be ventilated out and it must be replaced by heated replacement air taken into the factory hall.
In the most recent, so-called dry-silicone-coating process it has been possible to lower the quantities of solvents essentially. A drawback of that process is, however, the hydrogen produced by various catalysts, which hydrogen causes the risk of explosion in connection with disturbances in airconditioning.
The process in accordance with the present invention is characterized in that the band material is passed into contact with the spreading roller outside the trough formed by the spreading roller and by the scraper blade, whereby the coating substance is, in a way in itself known, transferred from the spreading roller onto the surface of the band material running in contact with the spreading roller.
The apparatus in accordance with the present invention is characterized in that it comprises means for passing the band material into contact with the spreading roller outside the trough formed by the spreading roller and by the scraper blade.
The process can be used for coating and treating various plastics and paper films. The apparatus is particularly suitable for silicone-coating of paper and film, but by its means it is also possible to apply other similar liquid, solvent-based coating substances, such as PVC, hot-jointing and coating varnishes etc. In the process in accordance with the invention, the solvent quantity in the paste to be applied can be reduced essentialiy, even down to 50%. Moreover, the process does not require methylketone or toluene as solvent, but as a solvent, e.g., the less toxic hexane is adequate.
The low quantities of solvent reduce the quantity of drying energy, reduce the cost of the coating, and the equipment does not necessarily require a recovery and burning plant for solvent vapours.
Despite the high dry-material content of the coating, by means of the apparatus it is possible to achieve very low quantities of coating substance per square metre of film to be coated. In trial runs of the apparatus, even coating quantities of 0.2 grams per square metre have been achieved.
Since the apparatus in accordance with the invention has a simple construction, its purchase price and operating costs are more advantageous than those of other methods.
The invention will be described more closely below with reference to the attached drawing, which is a schematical side view of an apparatus in accordance with the invention.
The apparatus includes a rotary hard-chromiumplated spreading roller 4, whose surface has received special treatment, e.g. sand-blasting, screenformation, or spark-treatment, and whose rate of revolution in relation to the speed of the band material (10) can be adjusted continuously. The roller has a proportionally adjusted drive, i.e. its speed in relation to the speed of the band web remains at the pre-set proportion.
An oscillating scraper blade 2 has been fitted in contact with the roller 4, which blade has been positioned diagonally so that its edge facing away from the roller is located higher than the edge in contact with the roller. In this way a trough remains between the roller and the blade, which trough forms a basin 11 for the paste to be applied. The scraper consists of a frame la a blade 2, and of a fastening 3 for the blade. The load of the scraper blade against the spreading roller can be adjusted continuously by means of a load F directed at the lever arm 5.
Above the paste basin 11 there is a supply tank 7 for the paste, from which the paste is supplied into the trough between the roller 4 and the blade 2 onto the upper face of the blade 2. By means of the circulation equipment for the paste to be applied, the paste is passed onto the blade 2 by pumping or by any other means. From here any excess paste flows as overflow from both ends of the scraper means back to the pumping basin (not shown in the drawing).
The apparatus additionally includes two guide rollers 8 and 9, which can be adjusted continuously and by means of which the angle of contact 10 and the time of contact of the web to be coated against the spreading roller is adjusted. In the drawing, another position of the rollers 8 and 9 and of the web 10 is shown by broken lines, in which position the contact angle is smaller.
When the apparatus is in operation, the spreading roller4 rotates in the direction shown in the drawing by the arrow A so that at the point of contact between the roller and the scraper blade 2 the face of the roller moves downwards and takes coating substance from the trough 11 through the slot between the roller 4 and the scraper blade 2 to underneath the scraper blade 2. The band material lotto be coated is passed below the spreading roller 4 in the direction shown by the arrows B, and the coating substance is transferred onto the band material while the material rubs against the roller.
The direction of movement of the band material is at the contact point with the roller parallel to the face of the roller, and the speed of movement of the material is preferably somewhat higher than the speed of the face of the roller. In the transfer of the substance onto the dosage roller 4, the gravity is utilized, and the evenness of the surface of the coating layer is achieved when the band passes underneath the spreading roller while rubbing. The guiding ofthe band material takes place by means of the guide rollers 8 and 9, without using a counterroller placed against the spreading roller.
The running speeds both of the spreading roller 4 and of the band material 10 can be adjusted. By changing the ratio of the speeds it is possible to adjust the quantity of the silicone coating per unit of area. Moreover, the quantity of coating can also be adjusted by changing the surface of contact of the film to be coated against the spreading roller, by means of the guide rollers 8 and 9, or by changing the blade pressure of the scraper. The type of the surface treatment of the spreading roller also affects the thickness of the coating layer.
The invention is not restricted to the embodiment described above alone, but it may vary even considerably within the scope of the patent claims. The process can be used for coating all sorts of band materials with various liquid or pasty coating substances.

Claims (10)

1. A process for coating band material (10) on one side with a liquid or pasty substance, in particular with a solvent-based coating, so that a scraper blade (2) is fitted against a rotary spreading roller (4) and the band material is guided so as to pass by the spreading roller (4) so that the band material contacts the spreading roller, and coating substance is passed to above the scraper blade, into a trough (11) formed by the mantle of the spreading roller (4) and by the scraper blade (2), whereby the direction of rotation of the spreading roller (4) is such that the surface of the spreading roller moves downwards at the contact point between the spreading roller and the scraper blade, characterized in that the band material (10) is passed into contact with the spreading roller (4) outside the trough (11) formed by the spreading roller and by the scraper blade (2), whereby the coating substance is, in a way in itself known, transferred from the spreading roller onto the surface of the band material running in contact with the spreading roller.
2. A process as claimed in claim 1, characterized in that the band material (10) is guided so asto pass by the spreading roller (4) underneath the spreading roller.
3. A process as claimed in claim 1 or 2, characterized in that the band material (10) is passed into contact with the spreading roller (4) without a counter-roller.
4. An apparatus for the implementation of the process as claimed in claim 1, which apparatus comprises a spreading roller (4) and a scraper blade (2) fitted in contact with the roller as well as means (7) for passing coating substance onto the scraper blade into the trough (11) formed by the mantle of the spreading roller (4) and by the scraper blade (2), characterized in that it comprises means for passing the band material (10) into contact with the spreading roller (4) outside the trough (11) formed by the spreading roller and by the scraper blade (2).
5. An apparatus as claimed in claim 4, characterized in that it includes circulation equipment for returning the coating substance that has flown down from the ends of the scraper blade (2) back onto the blade (2).
6. An apparatus as claimed in claim 4 or 5, characterized in that the pressure of the scraper blade (2) against the spreading roller (4) can be adjusted by loading a lever arm (5) fastened to the frame (1) of the scraper blade.
7. An apparatus as claimed in any of the claims 4 to 6, characterized in that the speed of rotation of the spreading roller (4) and/or the speed of movement of the band material can be adjusted.
8. An apparatus as claimed in any of the claims 4 to 7 and including two guide rollers (8, 9) for guiding the band material into contact with the spreading roller (4), characterized in that the position of one or both of the guide rollers is adjustable for the purpose of adjusting the angle of contact between the band material and the spreading roller (4).
9. A process according to claim 1 substantially as herein described with reference to the accompanying drawing.
10. Apparatus according to claim 4 substantially as herein described with reference to, and as illustrated in, the accompanying drawing.
GB8020817A 1979-06-28 1980-06-25 Coating band material Expired GB2059296B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI792053A FI63275C (en) 1979-06-28 1979-06-28 PROCEDURE FOR THE CONFORMITY OF CONSTRUCTION OF BANDMATERIAL MEDHJAELP AV EN BESTRYKNINGSVALS

Publications (2)

Publication Number Publication Date
GB2059296A true GB2059296A (en) 1981-04-23
GB2059296B GB2059296B (en) 1983-02-23

Family

ID=8512754

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8020817A Expired GB2059296B (en) 1979-06-28 1980-06-25 Coating band material

Country Status (4)

Country Link
DE (1) DE3023114A1 (en)
FI (1) FI63275C (en)
GB (1) GB2059296B (en)
IT (1) IT1132132B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3479908A1 (en) * 2017-11-03 2019-05-08 A & R Carton OY Method of and coating application unit for applying a coating on a web of material
CN117798009A (en) * 2024-03-01 2024-04-02 宣城海螺建筑光伏科技有限公司 Solar backboard coating device and method

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3701670A1 (en) * 1987-01-22 1988-08-04 Voith Gmbh J M Applicator mechanism for coating and moistening travelling material webs
JPH0659965B2 (en) * 1988-01-30 1994-08-10 ソマール株式会社 Thin film sticking device
DE102012204878A1 (en) * 2012-03-27 2013-10-02 Achenbach Buschhütten GmbH & Co. KG commissioned
ITFI20120137A1 (en) * 2012-06-29 2013-12-30 Perini Fabio Spa "DEVICE FOR THE APPLICATION OF A LIQUID SUBSTANCE ON A MATTRESS AND RELATED MATERIAL"

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3479908A1 (en) * 2017-11-03 2019-05-08 A & R Carton OY Method of and coating application unit for applying a coating on a web of material
CN117798009A (en) * 2024-03-01 2024-04-02 宣城海螺建筑光伏科技有限公司 Solar backboard coating device and method
CN117798009B (en) * 2024-03-01 2024-05-24 宣城海螺建筑光伏科技有限公司 Solar backboard coating device and method

Also Published As

Publication number Publication date
FI63275B (en) 1983-01-31
IT1132132B (en) 1986-06-25
FI792053A (en) 1980-12-29
DE3023114A1 (en) 1981-01-08
GB2059296B (en) 1983-02-23
IT8023053A0 (en) 1980-06-26
FI63275C (en) 1983-05-10

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PCNP Patent ceased through non-payment of renewal fee